1 | #!/usr/bin/python |
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2 | |
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3 | import sys, struct, logging |
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4 | |
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5 | # initialize logger |
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6 | logger = logging.getLogger("ippLogger") |
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7 | |
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8 | class IPPTags(): |
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9 | """ |
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10 | Contains constants for the various IPP tags, as defined by RFC |
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11 | 2565. |
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12 | """ |
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13 | |
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14 | # various tags |
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15 | ZERO_NAME_LENGTH = 0x00 |
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16 | OPERATION_ATTRIBUTES_TAG = 0x01 |
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17 | JOB_ATTRIBUTES_TAG = 0x02 |
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18 | END_OF_ATTRIBUTES_TAG = 0x03 |
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19 | PRINTER_ATTRIBUTES_TAG = 0x04 |
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20 | UNSUPPORTED_ATTRIBUTES_TAG = 0x05 |
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21 | |
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22 | # "out of band" value tags |
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23 | UNSUPPORTED = 0x10 |
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24 | DEFAULT = 0x11 |
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25 | UNKNOWN = 0x12 |
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26 | NO_VALUE = 0x13 |
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27 | |
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28 | # integer value tags |
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29 | GENERIC_INTEGER = 0x20 |
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30 | INTEGER = 0x21 |
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31 | BOOLEAN = 0x22 |
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32 | ENUM = 0x23 |
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33 | |
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34 | # octetstring value tags |
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35 | UNSPECIFIED_OCTETSTRING = 0x30 |
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36 | DATETIME = 0x31 |
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37 | RESOLUTION = 0x32 |
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38 | RANGE_OF_INTEGER = 0x33 |
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39 | COLLECTION = 0x34 |
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40 | TEXT_WITH_LANGUAGE = 0x35 |
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41 | NAME_WITH_LANGUAGE = 0x36 |
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42 | |
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43 | # character-string value tags |
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44 | GENERIC_CHAR_STRING = 0x40 |
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45 | TEXT_WITHOUT_LANGUAGE = 0x41 |
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46 | NAME_WITHOUT_LANGUAGE = 0x42 |
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47 | KEYWORD = 0x44 |
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48 | URI = 0x45 |
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49 | URI_SCHEME = 0x46 |
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50 | CHARSET = 0x47 |
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51 | NATURAL_LANGUAGE = 0x48 |
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52 | MIME_MEDIA_TYPE = 0x49 |
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53 | |
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54 | class IPPValue(): |
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55 | """ |
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56 | An IPP value consists of a tag and a value, and optionally, a name. |
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57 | |
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58 | From RFC 2565: |
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59 | ----------------------------------------------- |
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60 | | value-tag | 1 byte |
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61 | ----------------------------------------------- |
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62 | | name-length (value is u) | 2 bytes |
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63 | ----------------------------------------------- |
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64 | | name | u bytes |
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65 | ----------------------------------------------- |
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66 | | value-length (value is v) | 2 bytes |
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67 | ----------------------------------------------- |
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68 | | value | v bytes |
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69 | ----------------------------------------------- |
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70 | """ |
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71 | |
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72 | def __init__(self, value_tag, value): |
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73 | """ |
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74 | Initialize an IPPValue: |
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75 | |
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76 | Arguments: |
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77 | |
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78 | value_tag -- one byte, identifying the type of value |
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79 | |
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80 | value -- variable size, containing the actual value |
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81 | """ |
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82 | |
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83 | # make sure value_tag isn't empty |
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84 | assert value_tag is not None |
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85 | # make sure value isn't empty |
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86 | assert value is not None |
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87 | |
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88 | self.value_tag = hex(value_tag) |
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89 | self.value = str(value) |
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90 | |
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91 | class IPPAttribute(): |
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92 | """ |
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93 | In addition to what the RFC reports, an attribute has an |
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94 | 'attribute tag', which specifies what type of attribute it is. |
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95 | It is 1 bytes long, and comes before the list of values. |
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96 | |
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97 | From RFC 2565: |
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98 | |
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99 | Each attribute consists of: |
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100 | ----------------------------------------------- |
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101 | | value-tag | 1 byte |
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102 | ----------------------------------------------- |
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103 | | name-length (value is u) | 2 bytes |
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104 | ----------------------------------------------- |
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105 | | name | u bytes |
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106 | ----------------------------------------------- |
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107 | | value-length (value is v) | 2 bytes |
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108 | ----------------------------------------------- |
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109 | | value | v bytes |
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110 | ----------------------------------------------- |
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111 | |
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112 | An additional value consists of: |
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113 | ----------------------------------------------------------- |
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114 | | value-tag | 1 byte | |
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115 | ----------------------------------------------- | |
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116 | | name-length (value is 0x0000) | 2 bytes | |
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117 | ----------------------------------------------- |-0 or more |
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118 | | value-length (value is w) | 2 bytes | |
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119 | ----------------------------------------------- | |
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120 | | value | w bytes | |
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121 | ----------------------------------------------------------- |
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122 | """ |
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123 | |
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124 | def __init__(self, name, values): |
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125 | """ |
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126 | Initialize an IPPAttribute. |
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127 | |
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128 | Arguments: |
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129 | |
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130 | name -- the name of the attribute |
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131 | |
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132 | values -- a list of IPPValues. May not be empty. |
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133 | """ |
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134 | |
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135 | # make sure name isn't empty |
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136 | assert name is not None |
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137 | |
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138 | # make sure the list of values isn't empty |
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139 | assert len(values) > 0 |
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140 | # make sure each value is an IPPValue |
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141 | for value in values: assert isinstance(value, IPPValue) |
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142 | |
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143 | self.name = str(name) |
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144 | self.values = values |
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145 | |
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146 | def toBinaryData(self): |
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147 | """ |
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148 | Packs the attribute data into binary data. |
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149 | """ |
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150 | |
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151 | # get the binary data for all the values |
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152 | values = [] |
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153 | for v, i in zip(self.values, xrange(len(self.values))): |
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154 | if i == 0: |
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155 | name_length = sys.getsizeof(self.name) |
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156 | value_length = sys.getsizeof(v.value) |
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157 | values.append(struct.pack('>bh%ssh%ss' % (name_length, value_length), |
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158 | v.value_tag, |
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159 | name_length, |
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160 | self.name, |
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161 | value_length, |
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162 | v.value)) |
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163 | else: |
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164 | value_length = sys.getsizeof(v.value) |
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165 | values.append(struct.pack('>bhh%ss' % (value_length), |
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166 | v.value_tag, |
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167 | name_length, |
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168 | value_length, |
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169 | v.value)) |
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170 | |
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171 | # concatenate everything together and return it |
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172 | return ''.join(values) |
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173 | |
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174 | class IPPRequest(): |
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175 | """ |
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176 | From RFC 2565: |
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177 | |
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178 | The encoding for an operation request or response consists of: |
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179 | ----------------------------------------------- |
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180 | | version-number | 2 bytes - required |
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181 | ----------------------------------------------- |
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182 | | operation-id (request) | |
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183 | | or | 2 bytes - required |
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184 | | status-code (response) | |
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185 | ----------------------------------------------- |
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186 | | request-id | 4 bytes - required |
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187 | ----------------------------------------------------------- |
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188 | | xxx-attributes-tag | 1 byte | |
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189 | ----------------------------------------------- |-0 or more |
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190 | | xxx-attribute-sequence | n bytes | |
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191 | ----------------------------------------------------------- |
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192 | | end-of-attributes-tag | 1 byte - required |
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193 | ----------------------------------------------- |
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194 | | data | q bytes - optional |
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195 | ----------------------------------------------- |
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196 | """ |
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197 | |
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198 | # either give the version, operation_id, request_id, |
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199 | # attribute_sequence, and data, or a file handler (request) which |
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200 | # can be read from to get the request |
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201 | def __init__(self, version=None, operation_id=None, request_id=None, attributes=[], data=None, request=None): |
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202 | """ |
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203 | Create an IPPRequest. Takes either the segments of the |
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204 | request separately, or a file handle for the request to parse. |
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205 | If the file handle is passed in, all other arguments are |
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206 | ignored. |
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207 | |
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208 | Keyword arguments for passing in the segments of the request: |
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209 | |
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210 | version -- a tuple of two signed chars, identifying the |
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211 | major version and minor version numbers of the |
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212 | request |
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213 | |
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214 | operation_id -- a signed short, identifying the id of the |
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215 | requested operation |
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216 | |
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217 | request_id -- a signed int, identifying the id of the |
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218 | request itself. |
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219 | |
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220 | attributes -- (optional) a list of IPPAttributes |
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221 | |
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222 | data -- (optional) variable length, containing the actual |
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223 | data of the request |
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224 | |
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225 | Keyword arguments for passing in the raw request: |
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226 | |
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227 | request -- a file handle that supports the read() |
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228 | operation |
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229 | """ |
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230 | |
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231 | if request is None: |
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232 | # make sure the version number isn't empty |
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233 | assert version is not None |
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234 | # make sure verison is a tuple of length 2 |
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235 | assert isinstance(version, tuple) |
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236 | assert len(version) == 2 |
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237 | # make sure the operation id isn't empty |
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238 | assert operation_id is not None |
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239 | # make sure the request id isn't empty |
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240 | assert request_id is not None |
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241 | |
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242 | # if the request isn't None, then we'll read directly from |
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243 | # that file handle |
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244 | if request is not None: |
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245 | # read the version-number (two signed chars) |
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246 | self.version = struct.unpack('>bb', request.read(2)) |
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247 | logger.debug("version-number : (0x%X, 0x%X)" % self.version) |
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248 | |
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249 | # read the operation-id (or status-code, but that's only |
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250 | # for a response) (signed short) |
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251 | self.operation_id = struct.unpack('>h', request.read(2))[0] |
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252 | logger.debug("operation-id : 0x%X" % self.operation_id) |
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253 | |
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254 | # read the request-id (signed int) |
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255 | self.request_id = struct.unpack('>i', request.read(4))[0] |
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256 | logger.debug("request-id : 0x%X" % self.request_id) |
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257 | |
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258 | # now we have to read in the attributes. Each attribute |
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259 | # has a tag (1 byte) and a sequence of values (n bytes) |
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260 | self.attributes = [] |
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261 | |
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262 | # read in the next byte |
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263 | next_byte = struct.unpack('>b', request.read(1))[0] |
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264 | logger.debug("next byte : 0x%X" % next_byte) |
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265 | |
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266 | # as long as the next byte isn't signaling the end of the |
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267 | # attributes, keep looping and parsing attributes |
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268 | while next_byte != IPPTags.END_OF_ATTRIBUTES_TAG: |
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269 | |
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270 | attribute_group_tag = next_byte |
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271 | logger.debug("attribute-tag : %i" % attribute_group_tag) |
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272 | |
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273 | next_byte = struct.unpack('>b', request.read(1))[0] |
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274 | logger.debug("next byte : 0x%X" % next_byte) |
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275 | |
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276 | while next_byte > 0x0F: |
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277 | |
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278 | # read in the value tag (signed char) |
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279 | value_tag = next_byte |
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280 | logger.debug("value-tag : 0x%X" % value_tag) |
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281 | |
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282 | # read in the length of the name (signed short) |
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283 | name_length = struct.unpack('>h', request.read(2))[0] |
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284 | logger.debug("name-length : %i" % name_length) |
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285 | |
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286 | if name_length != IPPTags.ZERO_NAME_LENGTH: |
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287 | # read the name (a string of name_length bytes) |
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288 | name = request.read(name_length) |
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289 | logger.debug("name : %s" % name) |
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290 | |
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291 | # read in the length of the value (signed short) |
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292 | value_length = struct.unpack('>h', request.read(2))[0] |
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293 | logger.debug("value-length : %i" % value_length) |
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294 | |
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295 | # read in the value (string of value_length bytes) |
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296 | value = request.read(value_length) |
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297 | logger.debug("value : %s" % value) |
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298 | |
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299 | # create a new IPPAttribute from the data we just |
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300 | # read in, and add it to our attributes list |
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301 | self.attributes.append(IPPAttribute(name, |
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302 | [IPPValue(value_tag, value)])) |
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303 | |
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304 | else: |
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305 | # read in the length of the value (signed short) |
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306 | value_length = struct.unpack('>h', request.read(2))[0] |
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307 | logger.debug("value-length : %i" % value_length) |
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308 | |
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309 | # read in the value (string of value_length bytes) |
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310 | value = request.read(value_length) |
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311 | logger.debug("value : %s" % value) |
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312 | |
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313 | # add another value to the last attribute |
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314 | self.attributes[-1].values.append(IPPValue(value_tag, value)) |
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315 | |
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316 | # read another byte |
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317 | next_byte = struct.unpack('>b', request.read(1))[0] |
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318 | |
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319 | # once we hit the end-of-attributes tag, the only thing |
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320 | # left is the data, so go ahead and read all of it |
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321 | self.data = request.read() |
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322 | logger.debug("data : %s" % self.data) |
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323 | |
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324 | # otherwise, just set the class variables to the keyword |
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325 | # arguments passed in |
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326 | else: |
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327 | self.version = (int(version[0]), int(version[1])) |
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328 | self.operation_id = int(operation_id) |
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329 | self.request_id = int(request_id) |
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330 | self.attributes = attributes |
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331 | self.data = data |
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332 | |
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333 | def toBinaryData(self): |
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334 | """ |
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335 | Packs the value data into binary data. |
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336 | """ |
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337 | |
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338 | # convert the version, operation id, and request id to binary |
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339 | preattributes = struct.pack('>bbhi', |
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340 | self.version[0], |
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341 | self.version[1], |
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342 | self.operation_id, |
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343 | self.request_id) |
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344 | |
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345 | # convert the attributes to binary |
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346 | attributes = ''.join([a.toBinaryData() for a in self.attributes]) |
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347 | |
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348 | # conver the end-of-attributes-tag to binary |
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349 | end_of_attributes_tag = struct.pack('>b', IPPTags.END_OF_ATTRIBUTES_TAG) |
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350 | |
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351 | # convert the data to binary |
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352 | if self.data is not None: |
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353 | data = ''.join([struct.pack('>b', x) for x in self.data]) |
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354 | else: |
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355 | data = '' |
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356 | |
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357 | # append everything together and return it |
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358 | return preattributes + attributes + end_of_attributes_tag + data |
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